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Introduction to electric machines part 1b application of electric machines in the power system
Now, this is the second part of topic one in the series of electric machines and in this part
we will be discussing the different application of electric machines and we will start with the use
of AC machines which consist of AC generators and AC motors and this will be followed by the
discussion on DC machines which includes DC generators and motors and the application
will be easy for us to understand and hopefully it will help us visualize their practical usefulness
So, where are electric machines used now the answer is basically everywhere from our households to
industries and power plants of all sizes electric machines are a critical part of our lives which
without many of our tasks would be impossible we had previous discussions where there were
two types of electrical machines AC and DC so, now let's have a look at the practical applications
of AC machines first AC machines are two types we have generators and motors AC generators are
a major source of electricity generation and electrical utility generators and power plants
generate electricity for us and we all have seen backup and standby generators in our homes
in malls restaurants hospitals and virtually all commercial places these generators are known
as synchronous generators or alternators another type of generator you should know about are
induction or asynchronous generators and they are mainly used in wind turbines
Now, we will be discussing AC motors which we have divided into two further types we have induction
and synchronous motors let's talk about induction motors first induction motors are used at almost
every place that you can think of single phase induction motors are used for small
loads such as our household for example ceiling fans water pumps blow dryers hand mixers dryers
washing machines even the motors inside our refrigerator compressors are induction motors
Now, we will be discussing the very important three phase induction motors widely used for industrial
and commercial applications these are basically the workhorse of an industry and have a range
of application as feedwater pumps for boilers for HVAC system air ventilation and exhaust fans
industrial fans and coolers mixers grinders conveyor belts hoists elevators
cranes crossovers centrifuges fire pumps elevators winders lathas almost anything you can think of
even food processing industries paper printing machines textile industries oil and gas industries
and power generation plus and list goes on and on and all of them use induction motors another type
of AC motors is the AC synchronous motor they are used for application where precise and constant
speed is required they are used in robot actuators clocks record player turntables
also, make use of synchronous motors.
Synchronous motors are also used where high power loads at low speeds are
required such as a compressor, rolling mills, pulp grinder, reciprocating pumps, and so on
they are also used as synchronous condensers to improve the power factor of an electrical power system or the
electric grid that's all for AC machines now we will be talking about DC machines and just like AC
machines we have two types of DC machines the DC generators and the DC motors now, let's continue
to talk about DC generators earliest power system or DC system however now they have been obviously
replaced by AC systems electricity generation was done by DC generators till about the late 1800s
but now DC generators are used in small power supplies and portable generators for example
as power sources for standalone cellular telephone towers sometimes they are used
to control speed and torque of motors using lifts cranes trains because of the DC generator
stability in operation moreover they are used as voltage regulators to make up for the voltage
drop in DC distribution feeders such as railways and for adding voltage to the transmission line
to compensate for the line drops dc motors now lastly, we will talk about DC motors which are
commonly used in our households toys, robotic vehicles, electric shavers, electric toothbrushes
all of them use DC motors all your printers, hard disks, cd-ROMs, scanners, and photocopies
and extract machines these use dc motors small DC motors are mainly used as controlled devices
such as the tacho generators for speed sensing and in servo motors for positioning and tracking
DC motors are also used in all medical equipment which needs small and precise movement of fluids
such as a dialysis machine they also have industrial uses as steel rolling mill motors
and railway traction motors even the power window in automobiles car fans starting motors
and vehicles use DC motors brushless DC motors and brushed DC motors are used in electric machine and
it will be widely used in the future for the purpose as well now so far we have shared with
you a lot of application of electric machines and we hope that this video has served its purpose
the idea to discuss the application of machines before getting on to how they operate is necessary
though so that we may learn and we may relate what we're studying in real-life examples you know the
electric machines are an essential part of our world and most importantly electric motors are
used everywhere around us and later when we're studying about these machines we will already
know where they will be used now in our next video we'll be discussing AC machines in detail
including the operation and working oven AC motors and generators thank you we hope
that you have a continued interest in this topic and in this series as either a
student or professional we also hope that you find this content useful and enlightening, please
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